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Method for electrically repairing heavy metal As (Arsenic) contaminated soil by using rhamnolipid

A technology for polluted soil and rhamnolipid, which is applied in the field of microbial applications to achieve the effects of simple operating conditions, wide application range and improved removal rate

Active Publication Date: 2013-01-23
福建沃土环保集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a rhamnolipid electrodynamically repairing heavy metal As pollution with simple operating conditions, easy implementation, wide application range, low cost and high efficiency in view of the deficiencies in the prior art for repairing heavy metal arsenic pollution in soil. soil method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 10 kg of rhamnolipid with a mass content of 90% and add it to a dissolver, then add an appropriate amount of deionized water to heat and stir to dissolve, then add a pH regulator hydrochloric acid or / and sodium hydroxide to adjust the pH to 8, and prepare a concentration of 0.5 g / L, cooled to obtain rhamnolipid aqueous solution for subsequent use. Coal ash ceramsite and fine sand are mixed evenly at a weight ratio of 3:10. The function of fine sand is to prolong the residence time of heavy metal As in the permeable reaction wall, and put it into a sealed bag of a woven bag to make a permeable reaction wall for use. In the As-contaminated soil that needs to be treated, the two ends of the 8-meter-long zone are respectively provided with cathode electrolytic cell bodies made of ceramic materials. The length of the cathode electrolytic cell body is 0.4 meters, the width is 0.4 meters, and the height is 0.05 meters. Set up a water outlet near the positive electrolytic...

Embodiment 2

[0034]Weigh 10 kg of rhamnolipid with a mass content of 90% and add it to a dissolver, then add an appropriate amount of deionized water, heat and stir to dissolve, then add a pH regulator hydrochloric acid or / and potassium hydroxide to adjust the pH to 9, and prepare a concentration of 2g / L, cooling to obtain rhamnolipid aqueous solution for subsequent use. Coal ash ceramsite and fine sand are mixed evenly at a weight ratio of 4:10. The function of fine sand is to prolong the residence time of heavy metal As in the permeable reaction wall, and put it into a sealed bag of a cloth bag to make a permeable reaction wall for use. In the As-contaminated soil that needs to be treated, the four corners of the As-contaminated soil with a length of 8 square meters are respectively provided with cathode electrolytic cell bodies made of ceramic materials. The four cathode electrolytic cell bodies are 0.48 meters long, 0.48 meters wide, and It is 0.06 meters, and it is set close to the a...

Embodiment 3

[0036] Weigh 10 kg of rhamnolipid with a mass content of 90% and add it to the dissolver, then add an appropriate amount of deionized water to heat and stir to dissolve, then add pH regulator nitric acid or / and calcium hydroxide to adjust the pH to 10, and prepare a concentration of 4g / L, cooling to obtain rhamnolipid aqueous solution for subsequent use. Coal ash ceramsite and fine sand are mixed evenly at a weight ratio of 5:10. The function of fine sand is to prolong the residence time of heavy metal As in the permeable reaction wall, and put it into a sealed bag of a woven bag to make a permeable reaction wall for use. In the As-contaminated soil that needs to be treated, the two corners of one side of the 5 square meter zone are respectively provided with a cathode electrolytic cell body with a length of 0.48 meters, a width of 0.48 meters, and a height of 0.06 meters. The As-contaminated soil is installed close to the anode electrolytic cell, and the water outlet is prov...

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Abstract

The invention discloses a method for electrically repairing heavy metal As (Arsenic) contaminated soil by using rhamnolipid, which comprises the steps of controlling the moisture content of the soil to 27% to 33%, adding a rhamnolipid solution with concentration of 0.5 to 4g / L into a negative electrolytic tank, adding deionized water into a positive electrolytic tank, installing a permeable reaction wall consisting of lytags and fine sand with the weight ratio of (3 to 5) to 10 in an enrichment place of a pollutant heavy metal As, and switching on to electronically repair the As contaminated soil. The alkaline rhamnolipid solution provided by the invention can advance the removal ratio of the heavy metal As to 28.53%, wherein the total removal ratio of the heavy metal As is further advanced to about 40% by the permeable reaction wall, and the contribution ratio of the permeable reaction wall on the removal ratio is close to 90%, so that the alkaline rhamnolipid solution proves that the removal ratio of the heavy metal is promoted by the electrical repair and the permeable reaction wall. The method is simple in operation condition, wide in range of application, low in cost, high in efficiency, and liable to realize, and has better social benefit and biological benefit on the heavy metal As contaminated soil.

Description

technical field [0001] The invention belongs to the field of microbial application technology and the field of environmental technology, and relates to a method for electrically repairing heavy metal As polluted soil by using rhamnolipid. Background technique [0002] Soil is one of the main natural resources that human beings rely on for survival, and it is also an important part of the human ecological environment. With the intensification of industrial and urban pollution and the increase in the types and quantities of agricultural chemicals, soil heavy metal pollution is becoming more and more serious. Soil heavy metal pollutants are mainly lead, mercury, chromium, arsenic, cadmium, nickel and their compounds. Soil heavy metal pollution has the characteristics of poor mobility of pollutants in the soil, long residence time, and inability to be degraded by microorganisms. Plants and other media enter the human body through human digestive tract intake, respiratory tract ...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/08
Inventor 喻泽斌黄俊胡晓
Owner 福建沃土环保集团有限公司
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